search

jdesbonnet / RCWL-0516

Information about RCWL-0516 microwave proximity switch module (ICStation.com SKU 10630)
727 stars 105 forks source link

uni-direction detection #38

Open BD981 opened 4 years ago

BD981 commented 4 years ago

Can it be used for detecting uni-directional moving? Walking forward, back and especially parallel to the wall for example? I need to find out this issue. Could you please help? Thanks in advance.

Harvie commented 4 years ago

In theory it might be possible to detect if object moves towards the detector or away from it. That's something that should be possible using doppler effect used in this device. However i can't really tell how complex such mod would be.

This video might give you some insight: https://www.youtube.com/watch?v=Kzsh59TM4MY

paddyrg commented 4 years ago

Looking at the waveforms generated, it's way too marginal to do reliably. And it's not true Doppler, either, so I'd suggest there are far better ways to get the same result

gauravduggal commented 3 years ago

It is not possible to detect the direction of motion with this sensor since it gives you a real (in the mathematical sense) baseband signal at the output. We will need to make hardware modifications specifically we need an IQ demodulator so we get a complex (in the mathematical sense) baseband signal which on processing (Fourier Transform) can give you direction of motion. For more details you can checkout "A Visual Introduction to DSP for SDR" here https://kb.ettus.com/Cyberspectrum